The lower bank of cylinders is where the damage is - they are running 100 degrees cooler than the top bank, and oil flows freely into the blower drain and even into the exhaust. There is however no coolant getting into the oil, and the engine still has "good compression".

But quick / easy / cheap are all out of the question, sadly. (But not unexpectedly...)

We are looking at an in frame rebuild, or they think it might just be easier to take the engine out to work on it.

First challenge - they are trying to figure out how to get the serial number of an engine on a 4106 so that they can start looking up parts. Where they expect the serial number to be on an 8V71 is seemingly very hard to access. Any ideas? Does anyone know the specific Detroit Diesel model number that would have been in a 1961 GM-4106?

And....

It might be quicker, easier, and cheaper to find a "new" engine to swap in.

Just a thought, Have you considered looking for a silver 6V92 turbo if you are doing a swap? Don't know what the logistics is, but it is a really nice upgrade if you are paying for another engine anyway.

Just a thought, Have you considered looking for a silver 6V92 turbo if you are doing a swap? Don't know what the logistics is, but it is a really nice upgrade if you are paying for another engine anyway.

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He DOES need a lefty, and the 92 would be a good swap, but requires more labor for the install, many custom parts need to be fabricated for the fan system. The best system I've seen is to mount the fan on its own separate bracket and drive it with a cogged belt.>>>Dan

I have one of those fan set us on a 6-92 but the block is busted. I do have a LH 6V92TA DDEC III setting here with about 225 hrs. on it I don't think you would want to spend the money to convert it to an mui. Clifford may know where one may be.

Can't help on the replacement engine but something I've done to read an inaccessible serial number is to drop a digital camera in and take multiple pictures.

I have that model number and the serial numbers to a 1964. I don't have them at my office though. I can get them to you later tonight if my work day cooperates with me. I just checked my Picasa web account. I thought I had a picture, evidently not. I know where I have them written down though. IIRC theres a 4 and a 7 in it. lol, sorry, not much help.

I have one of those fan set us on a 6-92 but the block is busted. I do have a LH 6V92TA DDEC III setting here with about 225 hrs. on it I don't think you would want to spend the money to convert it to an mui. Clifford may know where one may be.

Input your model number below to learn more about your 2-Cycle or other Detroit-built engine. Model numbers consist of up to nine digits/letters that signify engine series, number of cylinders, application, rotation and type, design variations and specific model number.